An IMPORTANT NOTICE at the end of this data sheet addresses availability, . Changed all text, tables and graphics to match the new data sheet template. LM Datasheet, LM PDF, LM Data sheet, LM manual, LM pdf, LM, datenblatt, Electronics LM, alldatasheet, free, datasheet. VOUT = 10V. PRELOAD = mA. OBSOLETE PRODUCT. DATA SHEET FOR REFERENCE ONLY. Consult for possible alternate source.

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Lm70855 assume that means you don’t know but I hurt your feelings somehow in answering or commenting on some other question. However, we have updated the article.

You can’t assume there can be two exactly identical chips.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. What is impact due to current in these cases 1. On the other hand, energy actually being used is:. The voltage regulator produces constant output voltage of 5v with operating range input of v. At the very least, while it doesn’t, the other one is going to idle.

This difference between the input and output voltage is released as heat. It is simpler to use a bypass transistor or even a higher output regulator. If not, I am looking for an IC which has Operating range from v and constant 5v output. Sign up or log in Sign up using Google. Could you please explain a bit more, why the loosing regulator does not generate current?

Let’s say the input voltage is only 8. This keeps Q1 off, and things work as before. This pin is neutral for equally the input and output. Thanks for the details. It might shut down, it might gracefully reduce its output voltage.


Voltage Regulator IC | Datasheet | Pin Diagram & Description

Does this IC boost voltage input is voltage is less than 5? Thank you for clear explanation! Andy aka k 10 OP says nothing about the nature of the load, so that’s his problem. No, not without lm085.

The greater the difference llm7085 the input and output voltage, more the heat generated. When the current builds up to around mA, there will be enough voltage across R1 to start turning on Q1.

Sign up using Facebook. It’s best to use a larger regulator with higher capability.

All About IC 7805 | Voltage Regulator

For crucial applications, the parts can be tested and binned to use parts that are closer together. Thank you for pointing it out Steve. Normally, as current approaches the limit for thethe presence of the 6R8 resistor drops enough voltage for the MJ PNP BJT to turn on and start supplying more output current.

Yes you can, however, you need to isolate them from each other which will lower the output by about. This also allows for lower valued resistors. You used “might” three times. Log into your account. Rather get another voltage regulator that can handle the current. It is putting out 2. If you are going to be using a heatsink, better calculate the heatsink size properly. The second half of this doesn’t make any sense at all.

We have no information that the output voltage needs to be extra quiet.

IC 7805 (Voltage Regulator IC)

It takes the scaled output voltage as input Q1 and Q6 and provides an error signal to Q7 for indication if the voltage is too high or low. Short story is that you can’t reliably or cleanly get twice the current from two paralleled voltage regulators that ostensibly produce the same output. OP, the regulator outputs may not be exactly matched, so the current draw will typically not be shared equally.


I’ve seen it work. I think my first paragraph says so, in so many words. Please enter your name here. We are all non native english speaking people here. And Yes I have seen this happen when this exact same thing was tried, in lab, when I datashee a student, and another student tried this exact same setup, feeding the regulator circuit from a 12 volt 1 amp regulated power supply.

Please enter your comment! The voltage divider blue scales down the voltage on the output pin for use by the bandgap reference. The regulator still provides the regulation and acts as the voltage reference for the circuit to work. The moment the output voltage drops below that second regulator’s target voltage, it will “turn on”, and things will start to oscillate. Yes, if you can find two “identical” ICs. You can include diodes on each to protect them, but still they will not share the load evenly.

I have used a full bridge dataaheet along wd a transformer i tried to connect.

I agree that it’s not a good idea, but the question was “will it work?